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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb190bb6787d647a95fd3f96d173bc77e05f9f5c7e431230f10ac90b93453670' 
  AND token = 'ULfydLnQErTbIElRkuvkhmeeIbhgJuSYkCF4Pftu3ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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