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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cdf31eb496c6cebd4ad01917f34b02eccfed6eec7b0aa60ba2a8a908967867e' 
  AND token = 'OjUBvmSZ9XR3LGDh+2B4VvStp9iQ3If29FaKtWgbKwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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