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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447f2b493abb5f23c96400c7b2fdde52f3a332ca94a30f06144db27cf176dd71' 
  AND token = 'jfyDLdnMc4Q9wWdjKCj7slu+T/cg4skazI6Q2r2GJJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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