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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1bc9b85ec634cb39f5beec9f306aeb2506786eb07cbaa3ffc51a4998eeb69ee' 
  AND token = '9CT02Rw7cfQnTCZFqeNIh25HyLVvDkfXO7iengzaP9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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