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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3bc3af93cbacc895cfc2c1c5cbead1c7ef4990a72f73590b59f6a46f22d178' 
  AND token = 'Gp4yX947Du8pDRruPXWP1nwUWeIksEobgsKAE1YBKO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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