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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09da8dfc0101dbd404511bc3d2dc32f1c0a4c0716b898bedf5c59a1a63f9f835' 
  AND token = 'irvxOUksgcVggKoWZcSvpj8bE1YirB6mQ/eMYAExySw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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