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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf730dae1eb98a34430e0a0b376646642c8cd913c419106c8a86d834d5785efd' 
  AND token = 'uV5+PmyjD1tsSV/mVZhrp4SEGX0ky7ptkCMxCwj+OAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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