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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28361b066027be9a87633cf0686b6a10d12230df4d5606f2ac20f13a3b2d425' 
  AND token = 'KztVQ/tvkzMHw9JzKn7qK9h8dUxHSrV6ftAHI6fBfvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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