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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf1c11eafe2ccd568fa95ceb46c555dbc7bf16063b637a502c2e33e9c4bc1bd' 
  AND token = 'zHLthOFv791Xq3rAAQRp2ZkNugaUBprKiPQGs1moW8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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