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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3314f28cb93800411726d3ba9e449124439369c1c62cd2aaa996e988704d771' 
  AND token = 'J7tZM9UquEdrdhbUnlwd5XfsD6B8UMOe9dUooHyfzx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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