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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '533b019c74f2cf9e19784e89ef7715a0deb33fe3792a331896b3c592b21d2a16' 
  AND token = 'rFnEJBfc3bDuMyis4N6DM8jg32MhQXko9MswPhJ5ZYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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