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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2293dbf9168bd44e5866b32098dbde5ec44aad4db5b58a8eb93ea9f0a947a53e' 
  AND token = 'RDqBYkWoLlIe3f2wl2s5BpLXvR3DsdxOLzFvpF0jAyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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