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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5212320a0c6a276877f30dbefa705783aee1476c7af0f63bd8a53d647754047' 
  AND token = '8i5Hnle1Nb60FOla04C93+B1OqBdaUOQfZoRYBHSI18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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