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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b1dd5e07044b16dacc66be0b9ef84eb2ad62875bcf3865a4cd16790e1b7e1f' 
  AND token = 'h6+yCF51CHZndsVOMjdc92ibTBLajyPNvk6BETjCmwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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