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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d0aaa90fa2328b3e47b43a02c21d4e077a641962abc4c83514e4ab6e35b9b3' 
  AND token = 'RYB6FMwEK5dLhtoSjz464CE0ymxYRuwguPn6yaMX7bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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