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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aad3b43603ef0d1ae6e55a7dee42e4e53cde82830eab17e0238d06bf960864c' 
  AND token = '7Ios6xuD/Xrkb0L+wgZp8jSGxOuJ/tEQLHCtI+zWgSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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