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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcaf78dcd37f231fa0ed4bebd72895fc38171507dcc5fd8c80b93288d9cd8cdb' 
  AND token = 'Sv52J2myCwrvzZ8UPwNZkE+bBF43shuwzbvL7Xk4a2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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