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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c01c9775a44aab36cf9390a0ab90132ee91b670fed1ec68108226f4ff1030c1c' 
  AND token = '4rbh/y165WE1PlLSBeADlZ4iuy27jtJgEROYWJdzl8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}