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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9a0c61ec381013f7f0f9378df74274fd7146738f9392688346f10d0a7c5967' 
  AND token = 'FM0hwb4Wgw/JTfC6bEM2ATgnuazw1VNU1KPWrdI9UUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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