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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92477954b5d68ee9f0b0b38e96870a7051100430fab96a96fe7433bf0880efc0' 
  AND token = 'GtQLs9Z7jBsVyWCSoRBDwxKHxO1/vqaKKADk1dBCqmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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