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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd15ff93da84a2973d102b70e7cbae0248000512436f33010b4fefbea7087ed82' 
  AND token = 'PPlE/jm740ws+TSLYZpHTYE0YjYq5ViQV9EjkQkjDUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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