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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8408e7baa8a531514917b111566ec06214ed19144eecedbd919d31bd00cabc' 
  AND token = 'a7CyUoD3BI2wKczW6Irm5ER9pipgyphwa9/kM5Dg2Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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