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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b084e63157fca8c7de86d12276d2dac81afe3e0ce0a4312c95e2c42c24a40725' 
  AND token = 'dzFsTbiY76ULsqGfpxlv4ggsjAvwh0JqewbjOFJ7FnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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