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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aded36099148f5cab8df80cd7a9f645d5bb0f26a7752c448fc0fef00fd1c3df' 
  AND token = 'gtSR9AVNmYUlt1k1219hU4HD1NgF4gYvf6vjwIuLFa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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