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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e13ee33ec8c51e26c1c5aa0f2c04bb7af5be845b60c3ffcbf2f383ba272ed13' 
  AND token = 'o9+ZRluIwVCJtBXM8a2o2sl5cuD4yVXv7VNIw9Oger4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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