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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b5e5b425f0b213a7dd2c8298414ae41db03eaa2627a0494f3a8f93e180adab' 
  AND token = 'sYMPqlgRNfbU1byg0wqgPZIY7Ydzcf/nKxafDio5lFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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