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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e447d50f988c0077a47d6dea985a471527d4b57d14fa3b7a2f902f3209ed4b5e' 
  AND token = 'eEFZ90aKCko0CJGb2AwAqObn/CvgKXTr4jslmabDVc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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