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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c8a27dd6e82b852c05a1bfecfb53273fd1cd6076a3ac9d8e8dbbb39564dc38' 
  AND token = 'xL+CGFdcPo1pGCr8sKe2tYKTVC706ADxzcaXxma9qQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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