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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bebbde6c037b6e0dc83bb4a9a20a57d5c7df262d9353cbe8bc3265ccf1b39a47' 
  AND token = 'yrIKaBVEq1N4Rsxm7XG4LX3Fa7bjVLCwzLM9b2JVaEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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