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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9651ccdaca1feed926675ad1f580069466953daacbfe901e7e5c539df66822da' 
  AND token = 'DsRVn6G83rcInN//MSwvPDuYdPem3ttX1iepHyoECdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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