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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dca84974142655a23d0165c85201288fc0e4bc7ed7e1cd0af04403e0a42c8f8' 
  AND token = 'jXMFgniVFsdfxgv28fox2JQoMxxLHao1eOrotVf2gk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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