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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8038ce2096f101f2d931f21d0c51181cd0d4bc0763657a013133c8d30a02c10b' 
  AND token = 's6Bm1680dkrdI8BmFVQhyt0TWfbID0G3xNWeefgIRTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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