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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73796c35fb6c6913949117088786c4110e975000b0be2865ee3ca335513684b' 
  AND token = 's0HqfSgz/Wl/ey9EtFa2v4iWWCk2AGQ8hgB5PiRqtlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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