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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57838a2c48fba216373670f9762ca181dffe51e906d91895a3aeb7291eeb2534' 
  AND token = 'rkh6axFmuvJoAn/F86xc7RjXCrkY6W8IxqavrbDrz18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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