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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c3ffaa3093f59d514763ff4c2f4551c3a0f3dc96f30392de6bcd9a6ff1b476' 
  AND token = 'RZ+4+qQYjvQgWWS4GEs5oLswZ1+EQ9GEWDbxMDkPuCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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