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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eebcfda90c0df159884a07084a256682a5f8f776d07613d6c0167a6c63a716ca' 
  AND token = 'y0CQ6D/PPvAgCz+uNRieiwjX8oKS0h2pC0t+7WJBYN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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