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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008ac6adc85792e13684581e49c33c0867bb704c9ad7de8560df47a7f9e5afe3' 
  AND token = 'kbHB7jmFpRyV2RBEBv84FBm6XUBL17kXSkUrAW1LXco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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