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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da8e3106c82dc5215f2c85ed5dfb65147c0a2aff5a0e29ef038d5c2787abc4f' 
  AND token = '+URKgW6cdk5qweqFm6E6CV0du2ldZl19jTxE0pFWmrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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