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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b1769c383a8124436bede3c8e392edaeca393240b35ae694fc792a097dc8a54' 
  AND token = 'AGyjGmkvDJjYzzO6wkAIH1xZ+NF5eaycG0flXjHNFt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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