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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd653b5a775c93cafffde8864e1a40873c0f39b2471c4b5ef5ed85d32bb82059' 
  AND token = 'eJTyMWChwp1c7i0BccVkhiCjwJiO6kv8KS5qIEmbySA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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