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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832b4f19f16567de1b3793fed5998d35f66cb9e54a3453572b654ca30cca5625' 
  AND token = 'OL8XZ+0+oLKZnaL2f8Bf6SlTvMa/cSJITALeBBJH4+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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