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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fcff6e4dd3e12c31ebdb9b5eb128af2e759ff22883798b9220c7e6418bb5af5' 
  AND token = 'vVHAQCcD1bAsI+0uqkuNKWRp6BqhJBz2dbLMNOk+Dfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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