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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e551fbaebe95cad5446ab9e2eaefe08e28528e80e1f89f1be93790e9fc6db4d4' 
  AND token = '1H3azkNGkNezSzOunAtQVkUfcuFKOfX0j3jvvl0z1hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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