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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44fcd12ada903ca23028707b20d0f20707701d7daf532f0f190df326d6fc6a73' 
  AND token = 'xlsKnEaEMWKXIM8xG9QpIpgHp+dSwcQWvKvrlmpB8bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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