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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f432ab820274161311dd827e7a63f5b26ae0a303283088f12b80177ec78e7e9f' 
  AND token = 'selywkr4tCN/VmhOOXEXtcLAM75ifXFMaQbi+ZV6LE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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