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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c0e0032a19e94081ffaa26d861a8f52d54a38e6bfa6ad827d5e2e73b2c3982' 
  AND token = '81TZlDwxmyd4VVXwwhNuEtcbIpezTIQDYBKSHxZ5GQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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