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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf095f7678296c0b3b26b45cc6f56b3f29a087f16f976ad5a718a0c6ee0b7837' 
  AND token = 'L01p8PIHpT/YMK4dDDL8QLQHgr8h7Ue6nt0/LlQOMDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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