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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f5767e1fd31e455b1061472d0c2ae342524a0db68104f6eaea770757a7f4de' 
  AND token = 'JaSX0NapCWach7+npjxL7Wnk7bz5QKrcQl1MfzrINu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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