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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89395a39faae3d1d8697c2a95d67be01725b0901b3b44a98ea5791a1cfb104b5' 
  AND token = 'C5oF4NqIs0VdvJl1ITO0QwqtuD276AHB5A5OJ7sscDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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