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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0214a09d5aa6a63e327e5500e98ad324ab87dc72d203520be1ee7da3d6f0fd91' 
  AND token = 'zFB4NSQ2BFnsShiakPPP23b1J84167CPB/5jG/7OsoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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