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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe1dfd0027691341505598a19152ea86cb5b2fa82ed5d6e4f77ea31b69ff4a2' 
  AND token = 'nQ/ZMNCD4StdndhMPB2zVzR0NX6YvB8wTmHWEEAXjkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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