SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d847bb157a9c1f568a74872e0b3b823800ce2aeaf4dd6289f29c5c85eb34a76' 
  AND token = 'nqdg/SGm6JMVPNOdHi1kQz1Tw/GPxRrKi/M6Ba7+r3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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