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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7675c70e8b94de2f617652ea571ede03cecc5b4178d707e84131ffb0969d732' 
  AND token = 'KHieZ277V4N9dtYH6imaSAIscCtZjm/NiN0dzc6/wDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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