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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce301f5fe4d4331b56a9297d564ca06ce9f51b5c1fdad5dc5652b935988bb1a' 
  AND token = '5VcOHdLpZJWuRHbpRvGEpOIYpfPCKDpFmWJZ0iKxmlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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