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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c07782b710a9545c036a7678705f637c9e4f9ea4476fd7cd9d5ab97b6891a4' 
  AND token = 'f9QwrGD7/9DGSL0CUJHvJ9ThxcCSPeePlNsCmpHKR0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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