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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4be1599b7766cdd3b14982fea81ab32a3d9682963b677c9c28ec0afeb6468f2' 
  AND token = 'Jnoe7Cr5su9QxdBKnv2he68Ievj4RjHcbyPnX7LWpoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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