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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b55eb430989e4a698919e86d31a0666b5a04a90dc26ea33fbefc7688565a32' 
  AND token = 'Yazacsdnnp7NXu7cEaK7MNb7cZbjNI2NA1H7z6x2uM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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